74127421 has 2 divisors, whose sum is σ = 74127422. Its totient is φ = 74127420.

The previous prime is 74127419. The next prime is 74127433. The reversal of 74127421 is 12472147.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60621796 + 13505625 = 7786^2 + 3675^2 .

It is a cyclic number.

It is not a de Polignac number, because 74127421 - 2¹ = 74127419 is a prime.

It is a super-2 number, since 2×74127421² = 10989749088222482, which contains 22 as substring.

Together with 74127419, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 74127421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74127461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37063710 + 37063711.

It is an arithmetic number, because the mean of its divisors is an integer number (37063711).

Almost surely, 2^74127421 is an apocalyptic number.

It is an amenable number.

74127421 is a deficient number, since it is larger than the sum of its proper divisors (1).

74127421 is an equidigital number, since it uses as much as digits as its factorization.

74127421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3136, while the sum is 28.

The square root of 74127421 is about 8609.7282767809. The cubic root of 74127421 is about 420.0744784775.

Adding to 74127421 its reverse (12472147), we get a palindrome (86599568).

The spelling of 74127421 in words is "seventy-four million, one hundred twenty-seven thousand, four hundred twenty-one".